Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Princeton Univ., NJ (United States)
- Columbia Univ., New York, NY (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
A sequence of H-mode discharges with increasing levels of pre-discharge lithium evaporation (‘dose’) was conducted in high triangularity and elongation boundary shape in NSTX. Energy confinement increased, and recycling decreased with increasing lithium dose, similar to a previous lithium dose scan in medium triangularity and elongation plasmas. Data-constrained SOLPS interpretive modeling quantified the edge transport change: the electron particle diffusivity decreased by 10-30x. The electron thermal diffusivity decreased by 4x just inside the top of the pedestal, but increased by up to 5x very near the separatrix. These results provide a baseline expectation for lithium benefits in NSTX-U, which is optimized for a boundary shape similar to the one in this experiment.
- Research Organization:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC02-09CH11466; AC05-00OR22725; FC02-04ER54698; FC02-99ER54512; AC52-07NA27344
- OSTI ID:
- 1358036
- Alternate ID(s):
- OSTI ID: 1771440
- Report Number(s):
- PPPL-5278; LLNL-JRNL-820480; PII: S0920379616304550
- Journal Information:
- Fusion Engineering and Design, Vol. 117; ISSN 0920-3796
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
The charge exchange recombination spectroscopy diagnostic on the upgraded Lithium Tokamak eXperiment (LTX- β )
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journal | October 2018 |
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